<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
</head>
<body>
    <script>
      //交换两个变量
      let left = '苹果';
      let right = '橘子';

      let table;
      table = left;
      left = right;
      right = table;
      console.log(left, right);
    </script>
</body>
</html>